Democratic leaders rally behind Kamala Harris after Biden drops out.

Marianne Williamson, 72, challenges Harris' candidacy despite Biden's support.

Williamson is a best-selling author and spiritual leader with political ambitions.

She briefly suspended her 2024 presidential campaign but reentered after Biden’s debate struggles.

Williamson’s platform includes an Economic Bill of Rights and universal healthcare.

She advocates for aggressive climate action and renewable energy investments.

Her campaign promotes tuition-free public college and reducing student loan debt.

Williamson supports Medicare for All and comprehensive healthcare reform.

She calls for a peace-focused foreign policy and reduced military spending.